Method of controlling permeability damage of hydrocarbon...

Details Method of controlling permeability damage of hydrocarbon... Method of controlling permeability damage of hydrocarbon...

E - Fixed Constructions

21

B

166/1

E21B 43/24 (2006.01) E21B 47/00 (2006.01) E21B 47/06 (2006.01)

Patent

CA 1278747

ABSTRACT OF THE DISCLOSURE A method is disclosed for inhibiting permeability damage of clay minerals-containing hydro- carbon formations in the vicinity of a well during steam injection and for improving the injectivity of steam into that formation. That method comprises injecting a wet steam that comprises a sufficient amount of a source of ammonium ions to form an ammonium ion concentration of at least 0.01 N in the vapor phase condensate of the wet steam, a sufficient amount of either sodium bicarbonate, potassium bicarbonate, or mixtures thereof to raise the pH of the liquid phase of the wet steam to within the range of from 7.5 to 10.5; and a sufficient amount of a source of potassium ions to form a potassium ion concentration of at least 0.01 N in the liquid phase of the wet steam. The ammonium ions serve to inhibit permeability damage of hydrocarbon formations containing clay minerals in the vicinity of the vapor phase of the injected wet steam and to improve the injectivity of the wet steam into the formation in the vicinity of the vapor phase of the injected wet steam. The potassium ions serve, in the vicinity of the liquid phase to inhibit permeability damage of hydrocarbon formations containing clay minerals and to improve the injectivity of the wet steam into the formation.

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